Sand-blast machine.



PATENTED DEC. 13, 1904 G. R. A. GUTMANN.

SAND BLAST MACHINE.

APPLICATION FILED AUG. 10, 1903.

Z SHEE HG MODEL.

No. 777,201. PATENTED DEC. 13, 1904. G. R. A. GUTMANN.

SAND BLAST MACHINE.

APPLICATION FILED AUG. 10, 1903.

no MODEL. 2 SHEETS-SHEET 2.

Patented December 13, H304.

IINTTED STATES PATENT OFFICE.

GOTTFRIED RUDOLF ALFRED GUTMANN, OF HAMBURC, GERMANY, AS- SIGN OR TO THE FIRM OF ALFRED GUTMANN, AOIlTIENGESELLSOHAFT FUR MASOHINENBAU, OF ALTONA-OTTENSEN, OERh IANY.

SAND-BLAST MACHINE.

M SPECIFICATION forming part of Letters Patent No. 7"?7,201, dated December 13, 1904.

Application filed August 10, 1903. Serial No. 169,035. No model.)

To all whom it may concern.-

Be it known that I, Gorrrnmn RUDoLF AL- FRIED GUTMANN, a subject of the German Emperor, and a resident of Hamburg, Germany, have invented certain new and useful Im p re vements in Sand-Blast Machines, of which the following is a specification.

The present invention relates to improvements in machines for the treatment of cast metal or other articles by means of a sandblast. In order to obtain as uniform treatment as possible of all parts of the articles being operated upon in machines of this kind, it is necessary that the nozzles through which the sand-blast is directed upon the articles should be adapted to be moved over these latter. In machines of this class as hitherto constructed this has usually been effected by the intermediary of crank or lever mechanism in which a large number of links are necessary. These machines also present the defeet that the conduits for the supply of sand and air must participate to a greater or less extent in the displacement, so that it is neces sary to form them of flexible hose, which of course presents but little resistance to wean The object of this invention is, in the first place, to permit of dispensing with these nu merous links, and, secondly, the necessity for a flexible connection between the conduits and nozzles, these latter being attached to a rigid air and sand pipe in such a manner that its opening is adapted to be displaced in a circle or other curved path around the axis of the pipe.

In order that my invention may be more fully understood .by one skilled in the art to wvhich it appertains, I shall now proceed to describe the same in detail, reference being taken for that purpose to the accompanying sheetsof drawings, whereon- Figure 1 is an elevation, partly in section, of a sand-blast machine constructed in accordance with and embodying my invention; and Fig. 2 is a top view or plan of the said improved machine.

Similar letters of reference refer to similar parts.

According to this invention a conveyer-band uof the usual kind formed of a number of 5 transverse bars is provided. This band is driven in any convenient manner. The articles to be operated upon are placed upon this band, which conveys them into a suitable sheet-metal box 7), where they are submitted. to the sand-blast issuing from bent nozzles 0. These bent nozzles, which in the present instance are four in number, are firmly screwed into hollow shafts (Z, which are arranged in pairs alternating with each other. One of these hollow shafts (Z is driven by means of appropriate gear-wheels a, f, g, and It from a shaft vi and transmits its movement to the three other hollow shafts by the intermediary of chains Z: and chain-wheels Z. The 5 hollow shafts constitute stalling-boxes at their upper portion, and into these stufiing-boxes pipes at, rigidly mounted in brackets a, extend. These pipes m are connected, by means of rigid tubular conduits 0, with the laterally- 7 arranged sand-blast proper. (Not shown.) The used sand falls through the bars of the conveyer-band into a hopper p and is raised in known manner by means of a suitable lifting mechanism (indicated by dotted linesin Fig. l) and traveling at the top through a suitable guide-channel r. The sand thus raised is delivered upon a chute s, from which it slides down back into the laterally-arranged sand-blast.

The shaft v1 is operated by means of a chain t from the shaft a of the elevator mechanism. The rotation of shaft 2: is transmitted by a belt a to an intermediate shaft w, and this latter rotates, by means'of a chain :11, the driv- 5 ing-shaft y of the conveyer a.

In the example shown the articles to be subjected to the treatment of a sand-blast are carried along under the nozzles by means of an endless conveyer t 'aversing the box or 9 casing; but instead of the endless conveyer a working-table may be used which is arranged to rotate within the box under zles. Such an arrangement is, however, well the said nozsand-blast pipes each having a hollow shaft rotatably mounted in the discharge end, and

known in machines of the above kind and v a bent nozzle connected to each shaft, of a gear on one of the shafts, a driving-shaft, a I

needs, therefore, no further detailed description and representation.

Instead of rotating the pipes or hollow shafts (Z and the nozzles with a uniform speed, they may be rotatedwith a non-uniform speed in order to have at all parts a uniform action of the sand-blast or sand-blasts on the articles to be cleaned. The non-uniform rotation of the hollow shafts may be performed by any suitable transmission means in well-known manner.

Having fully described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a sand-blast apparatus, the combination with a plurality of stationary air and sand-blast pipes each having a hollow shaft mounted in the discharge end and a bent nozzle connected to each shaft, of a gear on one of the shafts, a driving-shaft, gearing operated by the shaft in mesh with the aforesaid gear, a sprocket on each of said hollow shafts, and a drive-chain connecting said sprockets.

2. In a sand-blast apparatus, the combination with a plurality of stationary air and bevel-gear thereon, an intermediate gearing in mesh with the bevel-gear and with the aforesaid gear on the hollow shaft, a sprocket on each of said hollow shafts and a drive-chain connecting said sprockets.

3. In a sand-blast apparatus, the combination with an endless conveyer, a driving-shaft therefor, a casing above and a hopper beneath the conveyor, an elevator in said hopper, a plurality of air and sandblast pipes, a rotatable hollow shaft mounted in the discharge end of each pipe and a bent nozzle on each of said shafts projecting into the casing, of a shaft for operating the elevator, a shaft driven by the latter shaft in gear with one of the hollow shafts, a sprocket on each of the hollow shafts, a chain connecting the sprockets, andmeans for connecting said driven shaft with the conveyer-shaft.

GOTTFRIED RUDOLF ALFRED GUTMANN,

Witnesses:

MAX LEMCKE, E. H. L. MUMMENHOFF. 

